JPH076707A - Color picture tube device - Google Patents

Abstract

PURPOSE:To prevent each of quadrupole lens electric-fields generated in order to provide a color picture tube device with high resolution characteristics from affecting a prefocusing lens electric-field. CONSTITUTION:A quadrupole lens electric-field is generated between a first focusing electrode 6 and a second focusing electrode 7, and a first auxiliary electrode 9 connected to the first focusing electrode 6 and a second auxiliary electrode 5 connected to the second focusing electrode 7 are arranged between an accelerating electrode 3 and the first focusing electrode 6 so that quadrupole lens electric-fields on the other hand can also be generated respectively between the first auxiliary electrode 9 and the second auxiliary electrode 5 and between the second auxiliary electrode 5 and the first focusing electrode 6. The first auxiliary electrode 9 is composed of a first metal plate 10 and a second metal plate 11. The first metal plate 10 has round electron beam transmission holes, and the second metal plate 11 on the other hand has non-round electron beam transmission holes.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high resolution color picture tube device comprising a color picture tube and a driving means thereof.

[0002]

2. Description of the Related Art The resolution characteristic of a color picture tube device depends on the size and shape of the beam spot, and a high resolution color picture tube device has a small diameter and a circular shape even at the peripheral portion of the phosphor screen surface. It must have the ability to generate near beam spots.

However, a self-convergence type deflection yoke mounted on a color picture tube having an in-line type electron gun generates a horizontal deflection magnetic field distorted in a pincushion shape and a vertical deflection magnetic field distorted in a barrel shape. The electron beam passing through the deflecting magnetic field undergoes a divergent field lens effect in the horizontal direction and a focusing field lens in the vertical direction. For this reason, the cross-sectional shape of the electron beam is distorted into a non-circular shape as the amount of deflection increases, and the beam spot generated in the central portion of the phosphor screen surface is a perfect circle, whereas in the peripheral portion of the phosphor screen surface. The generated beam spot is distorted into a non-circular shape with an elliptical high-brightness core section that is long in the horizontal direction and a low-brightness haze section that is long in the vertical direction. Absent.

The problem of such deflection distortion is disclosed in JP-A-3-
The problem can be solved by the conventional technique disclosed in Japanese Patent Publication No. 93135. In this case, three cathodes 1a, 1b, 1c arranged inline as shown in FIG. 3, a control electrode 2, an acceleration electrode 3, a plate-shaped first auxiliary electrode 4, a plate-shaped second auxiliary electrode 5, a box The first focusing electrode 6 of the mold, the second focusing electrode 7 of the box shape, and the final accelerating electrode 8 are arranged in this order. The first auxiliary electrode 4 serves as the first focusing electrode 6, and the second
The auxiliary electrodes 5 are respectively connected to the second focusing electrodes 7, and these focusing system electrodes have electron beam passage holes having a shape as shown in FIG.

A constant focus voltage V is applied to the first focusing electrode 6.
While f is applied, the focus voltage Vf and the dynamic voltage Vd superimposed on the focus voltage Vf are applied to the second focusing electrode 7. Since the dynamic voltage Vd rises with an increase in the deflection amount of the electron beam, the first focusing electrode 6 and the second focusing electrode 6
A quadrupole lens electric field which is focused in the horizontal direction and divergent in the vertical direction is generated between the focusing electrode 7 and the focusing electrode 7 as the deflection amount of the electron beam increases. Since the cross-sectional shape of the electron beam is distorted by this quadrupole lens electric field, the cross-sectional shape distortion of the electron beam in the deflection magnetic field described above can be canceled out as a result.

This makes it possible to keep the electron beam in an optimal focus state in both the horizontal and vertical directions. However, the electric field of the quadrupole lens and the magnetic field lens are at different positions, and they are different in the horizontal and vertical directions. Since the lens action is given to the electron beam, the lens magnification in the vertical direction becomes smaller than the lens magnification in the horizontal direction, and the vertical diameter of the beam spot generated in the peripheral portion of the phosphor screen surface tends to be too small, This causes moire.

Therefore, the first auxiliary electrode 4 and the second auxiliary electrode 5 are added so as to be horizontally divergent between both auxiliary electrodes 4 and 5 and between the second auxiliary electrode 5 and the first focusing electrode 6. To
By generating a quadrupole lens electric field that is focused in the vertical direction, the lens magnifications in the horizontal and vertical directions are made substantially equal.

[0008]

In the color picture tube device having such a structure, it is possible to obtain extremely good resolution characteristics. However, the electron beam passage hole 4a in the plate-shaped first auxiliary electrode 4, The opening shapes of 4b and 4c are
It is necessary that the end surface on the second auxiliary electrode 5 side is horizontally long with its long axis in the horizontal direction, and the end surface on the accelerating electrode 3 side is circular. In addition, since the quadrupole lens electric field generated on the second auxiliary electrode 5 side and the prefocus lens electric field generated on the accelerating electrode 3 side are close to each other, there is a problem that both lens electric fields interfere with each other.

In particular, the central axes of the electron beam passage holes 4a and 4c on both sides of the first auxiliary electrode 4 are shifted outward from the central axes of the electron beam passage holes 3a and 3c on both sides of the acceleration electrode 3. As a result, the quadrupole lens electric field interferes with the prefocus lens electric field in the color picture tube device adopting the convergence method in which the electron beams on both sides are displaced inward, thereby concentrating the three electron beams at one point on the phosphor screen surface. Then, a satisfactory convergence effect cannot be obtained.

Therefore, an object of the present invention is to provide an electrode structure in which first and second auxiliary electrodes are added, but the electron beam passage hole of the first auxiliary electrode does not require a complicated shape, and the first auxiliary electrode has It is to provide a color picture tube device in which the quadrupole lens electric field generated on the second auxiliary electrode side and the lens electric field generated on the accelerating electrode side do not interfere with each other.

[0011]

According to the present invention, in order to solve the above-mentioned problems, a cathode, a control grid electrode, an acceleration electrode to which a constant acceleration voltage is applied, and a first focusing to which a constant focus voltage is applied. An electrode, a second focusing electrode and a final accelerating electrode to which a dynamic voltage that gradually increases with an increase in the deflection amount of the electron beam from the focus voltage are applied are sequentially arranged, and a first focusing electrode and a second focusing electrode are provided. A quadrupole lens field that is horizontally focused and divergent vertically, while a first auxiliary electrode connected to the first focusing electrode and a second auxiliary electrode connected to the second focusing electrode Are sequentially arranged between the acceleration electrode and the first focusing electrode,
A color picture tube for generating a quadrupole lens electric field which is divergent in the horizontal direction and convergent in the vertical direction between the first auxiliary electrode and the second auxiliary electrode and between the second auxiliary electrode and the first focusing electrode. In the apparatus, the first auxiliary electrode has a first metal plate provided on the accelerating electrode side, and a second metal plate provided on the second auxiliary electrode side with a plate surface placed away from the plate surface of the first metal plate. And the first metal plate has a circular electron beam passage hole,
Further, there is provided a color picture tube device, wherein the second metal plate has a non-circular electron beam passage hole, respectively.

[0012]

Since the first auxiliary electrode is composed of the first metal plate and the second metal plate which has the plate surface at a position apart from the plate surface of the first metal plate, the two metal plates have different shapes. By forming the electron beam passage hole, complicated processing is not necessary. Moreover, since the distance between the quadrupole lens electric field generated on the second auxiliary electrode side and the prefocus lens electric field is widened, the adverse effects of mutual influence of both lens electric fields can be eliminated or reduced. Further, since the plate thicknesses of the first metal plate and the second metal plate, the shape of the electron beam passage hole, and the distance between the second metal plate and the second auxiliary electrode can be selected in a relatively wide range, The selectivity of the intensity of the quadrupole lens electric field generated between the first auxiliary electrode and the second auxiliary electrode is enhanced.

[0013]

Embodiments of the present invention will now be described with reference to the drawings.

The electrode structure shown in FIGS. 1 and 2 differs from the conventional electrode structure shown in FIGS. 3 and 4 in that the first auxiliary electrode 9 is separated from the first metal plate 10 and its plate surface. A second metal plate 11 for placing the plate surface at a position, and a first
The three electron beam passage holes 10a, 10b, 10c arranged inline in the metal plate 10 are formed in a circular shape, and the three electron beam passage holes 11a, 11b, 11c arranged inline in the second metal plate 11 are horizontal. The point is that it is formed in a horizontal rectangular shape with the long axis in the direction, and the other configurations are the same.

The second auxiliary electrode 5 has three vertically long electron beam passage holes 5a, 5b, 5c with the long axis in the vertical direction, and the first focusing electrode 6 has an end face on the second auxiliary electrode 5 side. In addition, three horizontally long electron beam passage holes 6 with the long axis in the horizontal direction
d, 6e, 6f, the end surface on the second focusing electrode 7 side has
Three vertically long electron beam passage holes 6 with the long axis in the vertical direction
It has a, 6b and 6c. In addition, the second focusing electrode 7 has three horizontally long electron beam passage holes 7 having a long axis in the horizontal direction.
It has a, 7b, and 7c on the end face on the first focusing electrode 6 side. The second focusing electrode 7 and the final accelerating electrode 8 have electron beam passage holes 7d, 7e, 7f and 8a, 8b, 8c for generating the main lens, respectively, on their end faces facing each other.

Since the first metal plate 10 and the second metal plate 11 are connected to the first focusing electrode 6, a constant focus voltage Vf is applied to them. The second subsidy electrode 5 is the second
Since it is connected to the focusing electrode 7, a dynamic voltage Vd that gradually increases from the focus voltage Vf as the deflection amount of the electron beam increases is applied to the focusing electrode 7.

The distance between the plate surfaces of the first metal plate 10 and the second metal plate 11 is equal to the circular electron beam passage hole 1 of the first metal plate 10.
It is desirable to set it to a value equal to or more than the sum of the hole diameters of 0a, 10b, 10c and the vertical diameters of the oblong electron beam passage holes 11a, 11b, 11c of the second metal plate 11. With this configuration, the prefocus lens electric field generated between the acceleration electrode 3 and the first metal plate 10 is always maintained constant without being affected by the dynamic voltage. For this reason, of the three electron beam passage holes 10a, 10b, 10c arranged inline in the first metal plate 10, the respective central axes of the electron beam passage holes 10a, 10c on both sides are arranged on both sides of the acceleration electrode 3. It does not hinder the convergence effect of displacing the electron beams on both sides to the inside by shifting the electron beams from the respective central axes of the electron beam passage holes 3a and 3c to the outside.

Further, the plate thickness of the end faces of the second metal plate 11, the second auxiliary electrode 5 and the first focusing electrode 6 on the second auxiliary electrode side, the distance between the plate faces, and the shape and size of the electron beam passage hole. Of the quadrupole lens electric field generated between the second metal plate 11 and the second auxiliary electrode 5 and the quadrupole lens electric field generated between the second auxiliary electrode 5 and the first focusing electrode 6. The strength can be optimally selected.

[0019]

As described above, according to the present invention, not only is it possible to always generate a beam spot having a nearly circular shape over the entire area of the phosphor screen surface, but also the first auxiliary electrode can be constructed in a relatively simple manner. Mutual interference between the quadrupole lens electric field generated between the auxiliary electrode and the second auxiliary electrode and the prefocus lens electric field generated between the first auxiliary electrode and the acceleration electrode can be eliminated or reduced.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an electrode configuration of a color picture tube device according to an embodiment of the present invention.

FIG. 2 is a plan view showing a plate surface shape of a focusing electrode according to an embodiment of the present invention.

FIG. 3 is a sectional view showing an electrode configuration of a conventional color picture tube device.

FIG. 4 is a plan view showing a plate surface shape of a focusing system electrode of a conventional color picture tube device.

[Explanation of symbols]

 3 Acceleration electrode 5 2nd auxiliary electrode 6 1st focusing electrode 7 2nd focusing electrode 9 1st auxiliary electrode 10 1st metal plate 11 2nd metal plate

Claims (3)

[Claims] 1. A cathode, a control grid electrode, an accelerating electrode to which a constant accelerating voltage is applied, a first focusing electrode to which a constant focus voltage is applied, and gradually as the amount of deflection of an electron beam from the focus voltage increases. A second focusing electrode and a final accelerating electrode to which a rising dynamic voltage is applied are sequentially arranged, and are horizontally focused and divergent vertically between the first focusing electrode and the second focusing electrode. A first auxiliary electrode connected to the first focusing electrode and a second auxiliary electrode connected to the second focusing electrode between the accelerating electrode and the first focusing electrode. Arranged sequentially, between the first auxiliary electrode and the second auxiliary electrode and between the second auxiliary electrode and the first focusing electrode to be divergent in the horizontal direction and focused in the vertical direction. Quadrupole lens In the color picture tube device, the first auxiliary electrode is provided with a first metal plate provided on the accelerating electrode side, and a plate surface is placed at a position apart from the plate surface of the first metal plate, and the first auxiliary electrode is provided on the second auxiliary electrode side. And a second metal plate provided, wherein the first metal plate has a circular electron beam passage hole, and the second metal plate has a non-circular electron beam passage hole. Color picture tube device. 2. The second metal plate has a horizontally long electron beam passage hole having a long axis in the horizontal direction, and the second auxiliary electrode has a vertically long electron beam passage hole having a long axis in the vertical direction. 2. The color picture tube device according to claim 1, wherein the first focusing electrode has a laterally long electron beam passage hole whose major axis lies in the horizontal direction on the end surface on the side of the second auxiliary electrode. 3. The distance between the first metal plate and the second metal plate is not less than the sum of the hole diameter of the electron beam passage hole of the first metal plate and the vertical diameter of the electron beam passage hole of the second metal plate. The color picture tube device according to claim 2, wherein the value is set to a value.